Divestiture (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended									12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax [Abstract]
Revenues										$ 538.8	$ 1,993.1	$ 1,891.9
Earnings from discontinued operations before income taxes										69.2	399.3	382.2
Provision for income taxes										71.6	136.5	135.3
Net earnings from discontinued operations before gain on disposal of discontinued operations										(2.4)	262.8	246.9
Gain on disposal of discontinued operations, less costs to sell										102.3	15.6	58.8
Provision for income taxes										23.9	5.1	22.1
Net gain on disposal of discontinued operations										78.4	10.5	36.7
Net earnings from discontinued operations	$ 79.2	$ (0.7)	$ (1.0)	$ (1.4)	$ 55.5	$ 89.5	$ 63.8	$ 64.4		76.0	273.3	283.6
Assets of Disposal Group, Including Discontinued Operation [Abstract]
Cash	0.0				399.6					0.0	399.6	$ 294.9
Accounts receivable, net					301.6						301.6
Property, plant and equipment, net					110.3						110.3
Goodwill					1,230.3						1,230.3
Intangible assets, net					141.3						141.3
Other assets					247.1						247.1
Total assets	0.0				2,430.2					0.0	2,430.2
Liabilities of Disposal Group, Including Discontinued Operation [Abstract]
Accounts payable					17.6						17.6
Accrued expenses and other current liabilities					128.9						128.9
Accrued payroll and payroll related expenses					100.0						100.0
Income taxes payable					0.7						0.7
Deferred Revenues					233.5						233.5
Deferred income taxes					72.8						72.8
Other liabilities					48.0						48.0
Total liabilities	$ 0.0				$ 601.5					$ 0.0	$ 601.5
Common stock, par value	$ 0.10				$ 0.10					$ 0.10	$ 0.10
Procure-to-Pay Solutions [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Date	Jun. 26, 2015
Dealer [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Date				Sep. 30, 2014
Liabilities of Disposal Group, Including Discontinued Operation [Abstract]
Separation costs										$ 50.1
CDK Global Inc [Member]
Liabilities of Disposal Group, Including Discontinued Operation [Abstract]
Date of record for ADP stockholders to receive CDK shares										9/24/2014
Number of CDK shares for three ADP Shares	$ 1									$ 1
Common stock, par value	0.01									0.01
ADP shares converted to CDK	$ 3									$ 3
Shares Distributed of CDK common stock	160.6									160.6
OHS [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Date						Feb. 28, 2014
Taxware [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Date									Dec. 17, 2012